/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.jena.query.spatial;

import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

import com.hp.hpl.jena.graph.Node;
import com.hp.hpl.jena.rdf.model.Property;
import com.hp.hpl.jena.rdf.model.Resource;
import com.hp.hpl.jena.rdf.model.ResourceFactory;

/**
 * Definition of a "document"
 */
public class EntityDefinition {

	private final String entityField;
	private final String geoField;
	private final Set<Node> WKTPredicates;
	private final Set<Node> builtinWKTPredicates;
	private final Set<SpatialPredicatePair> spatialPredicatePairs;
	private final Set<SpatialPredicatePair> builtinSpatialPredicatePairs;

	private final static String geo_ns = "http://www.w3.org/2003/01/geo/wgs84_pos#";
	public final static Property geo_latitude = ResourceFactory
			.createProperty(geo_ns + "lat");
	public final static Property geo_longitude = ResourceFactory
			.createProperty(geo_ns + "long");
	public final static Property geo_geometry = ResourceFactory
			.createProperty(geo_ns + "geometry");

	public final static Property geosparql_asWKT = ResourceFactory
			.createProperty("http://www.opengis.net/ont/geosparql#asWKT");

	public final static Resource geosparql_wktLiteral = ResourceFactory
			.createResource("http://www.opengis.net/ont/geosparql#wktLiteral");

	/**
	 * @param entityField
	 *            The entity being indexed (e.g. it's URI).
	 */
	public EntityDefinition(String entityField, String geoField) {
		this.entityField = entityField==null || entityField.isEmpty() ? "entityField":entityField;
		this.geoField = geoField==null || geoField.isEmpty() ? "geoField":geoField;
		this.WKTPredicates = new HashSet<Node>();
		this.builtinWKTPredicates = new HashSet<Node>();
		this.spatialPredicatePairs = new HashSet<SpatialPredicatePair>();
		this.builtinSpatialPredicatePairs = new HashSet<SpatialPredicatePair>();
		initBuiltinPredicates();
	}

	private void initBuiltinPredicates() {
		addBuiltinWKTPredicate(geo_geometry);
		addBuiltinWKTPredicate(geosparql_asWKT);
		addBuiltinSpatialPredicatePair(geo_latitude, geo_longitude);
	}
	
	private boolean addBuiltinWKTPredicate(Resource predicate) {
		builtinWKTPredicates.add(predicate.asNode());
		return addWKTPredicate(predicate);
	}

	public boolean addWKTPredicate(Resource predicate) {
		return WKTPredicates.add(predicate.asNode());
	}

	private boolean addBuiltinSpatialPredicatePair(Resource latitude_predicate,
			Resource longitude_predicate) {
		builtinSpatialPredicatePairs.add(new SpatialPredicatePair(
				latitude_predicate.asNode(), longitude_predicate.asNode()));
		return addSpatialPredicatePair(latitude_predicate, longitude_predicate);
	}
	
	public boolean addSpatialPredicatePair(Resource latitude_predicate,
			Resource longitude_predicate) {
		return spatialPredicatePairs.add(new SpatialPredicatePair(
				latitude_predicate.asNode(), longitude_predicate.asNode()));
	}
	

	public String getEntityField() {
		return entityField;
	}

	public String getGeoField() {
		return geoField;
	}

	public boolean isWKTPredicate(Node predicate) {
		return this.WKTPredicates.contains(predicate);
	}

	public boolean isSpatialPredicate(Node predicate) {
		return this.getSpatialPredicatePair(predicate) != null;
	}

	public boolean isLatitudePredicate(Node predicate) {
		return this.getSpatialPredicatePair(predicate).getLatitudePredicate()
				.equals(predicate);
	}

	public SpatialPredicatePair getSpatialPredicatePair(Node predicate) {
		Iterator<SpatialPredicatePair> it = this.spatialPredicatePairs
				.iterator();
		while (it.hasNext()) {
			SpatialPredicatePair pair = it.next();
			if (pair.getLatitudePredicate().equals(predicate)
					|| pair.getLongitudePredicate().equals(predicate)) {
				return pair;
			}
		}
		return null;
	}
	
	public int getCustomSpatialPredicatePairCount(){
		return this.spatialPredicatePairs.size()-builtinSpatialPredicatePairs.size();
	}
	
	public int getSpatialPredicatePairCount(){
		return this.spatialPredicatePairs.size();
	}
	
	public int getCustomWKTPredicateCount(){
		return this.WKTPredicates.size()- builtinWKTPredicates.size();
	}
	
	public int getWKTPredicateCount(){
		return this.WKTPredicates.size();
	}
	
	public boolean hasSpatialPredicatePair(Node latitude_predicate, Node longitude_predicate){
		Iterator<SpatialPredicatePair> it = this.spatialPredicatePairs
				.iterator();
		while (it.hasNext()) {
			SpatialPredicatePair pair = it.next();
			if (pair.getLatitudePredicate().equals(latitude_predicate)
					&& pair.getLongitudePredicate().equals(longitude_predicate)) {
				return true;
			}
		}
		return false;
	}

	@Override
	public String toString() {
		return entityField + ":" + geoField;

	}
}
